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Built 2026-10-19 (19 October 2026)

Rpf 170 Threshold Days by Year (ASN00008112)

4 fixed thresholds counted per year at Rpf 170 (ASN00008112): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rpf 170 Thresholds

  • Rpf 170: days with 10 mm (0.39 in) or more of precipitation in 29 years, most in 1915 with 17.
  • Rpf 170: days with 25 mm (0.98 in) or more of precipitation in 28 years, most in 1915 with 11.
  • Rpf 170: days with 50 mm (1.97 in) or more of precipitation in 24 years, most in 1915 with 5.
  • Rpf 170: days with 100 mm (3.94 in) or more of precipitation in 8 years, most in 1920 with 1.
  • 4 fixed thresholds have at least one qualifying day at Rpf 170.
29 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Rpf 170 Days per year at Rpf 170 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 17 in 1915. 051015201911: 41912: 81913: 91914: 81915: 171916: 91917: 61918: 91919: 31920: 41922: 61923: 91924: 71925: 71928: 61929: 41934: 31935: 61936: 71937: 61938: 61939: 151940: 101941: 41942: 41943: 31945: 61946: 41947: 51911191419171920192419291936193919421946
Days per year at Rpf 170 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 17 in 1915.
Days with 10 mm (0.39 in) or more of precipitation per year at Rpf 170
YearDaysDecade average
191148.1
191288.1
191398.1
191488.1
1915178.1
191698.1
191768.1
191898.1
191938.1
192046.1
192266.1
192396.1
192476.1
192576.1
192866.1
192946.1
193437.2
193567.2
193677.2
193767.2
193867.2
1939157.2
1940105.1
194145.1
194245.1
194335.1
194565.1
194645.1
194755.1
First to last qualifying date each year at Rpf 170 For each year, a bar from the first to the last day at Rpf 170 meeting 10 mm (0.39 in). 1911: 10 June 1911 to 9 September 19111912: 11 May 1912 to 2 August 19121913: 19 April 1913 to 16 October 19131914: 8 June 1914 to 23 November 19141915: 18 January 1915 to 20 October 19151916: 20 January 1916 to 16 November 19161917: 28 January 1917 to 21 October 19171918: 12 January 1918 to 14 November 19181919: 8 May 1919 to 4 November 19191920: 19 March 1920 to 7 July 19201922: 26 March 1922 to 17 September 19221923: 23 January 1923 to 4 October 19231924: 14 April 1924 to 16 October 19241925: 16 March 1925 to 10 October 19251928: 7 February 1928 to 12 November 19281929: 26 February 1929 to 7 September 19291934: 26 July 1934 to 31 October 19341935: 23 January 1935 to 20 October 19351936: 22 May 1936 to 23 December 19361937: 26 January 1937 to 30 November 19371938: 29 April 1938 to 29 September 19381939: 23 February 1939 to 3 August 19391940: 19 May 1940 to 11 October 19401941: 23 May 1941 to 15 September 19411942: 3 May 1942 to 27 October 19421943: 25 February 1943 to 14 August 19431945: 16 February 1945 to 31 December 19451946: 29 May 1946 to 25 August 19461947: 20 March 1947 to 30 August 194719111915191919241934193819421947JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rpf 170 meeting 10 mm (0.39 in).
First to last qualifying date each year at Rpf 170
YearFirst dateLast date
19111911-06-101911-09-09
19121912-05-111912-08-02
19131913-04-191913-10-16
19141914-06-081914-11-23
19151915-01-181915-10-20
19161916-01-201916-11-16
19171917-01-281917-10-21
19181918-01-121918-11-14
19191919-05-081919-11-04
19201920-03-191920-07-07
19221922-03-261922-09-17
19231923-01-231923-10-04
19241924-04-141924-10-16
19251925-03-161925-10-10
19281928-02-071928-11-12
19291929-02-261929-09-07
19341934-07-261934-10-31
19351935-01-231935-10-20
19361936-05-221936-12-23
19371937-01-261937-11-30
19381938-04-291938-09-29
19391939-02-231939-08-03
19401940-05-191940-10-11
19411941-05-231941-09-15
19421942-05-031942-10-27
19431943-02-251943-08-14
19451945-02-161945-12-31
19461946-05-291946-08-25
19471947-03-201947-08-30

Every Fixed Threshold

Fixed thresholds at Rpf 170
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain291719155
25 mm (0.98 in): Days with 25 mm or more rain281119153
50 mm (1.97 in): Days with 50 mm or more rain24519153
100 mm (3.94 in): Days with 100 mm or more rain8119201

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1911.

Download the Data

  • Data for Rpf 170 threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).